package  {
	import flash.net.*;
	import flash.events.Event;
	import flash.events.IOErrorEvent;
	import flash.events.SecurityErrorEvent;
	
	public class LumbarLog {
		// The user id that must be provided after 
		// user has successfully logged in.
		public static var USER_ID:String;
		// Can be 0 = lumbar anat 
		// or 1 = ultrasound
		public static var APP:uint;
		// This var holds state of logging. If true, then user is logged in
		private static var IS_LOGGING:Boolean = false;
		//
		private static var url:URLRequest = new URLRequest('http://opennet-33-65.uhnres.utoronto.ca/~michaelcorrin/Experiments/interServer/lumbarLogTest.php');
		LumbarLog.url.method = URLRequestMethod.POST;
		// 
		private static var urlLoader = new URLLoader();
		LumbarLog.urlLoader.addEventListener(Event.COMPLETE, onLoaderComplete);
		LumbarLog.urlLoader.addEventListener(IOErrorEvent.IO_ERROR, onLoaderError);
		LumbarLog.urlLoader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
		
		// CONSTRUCTOR
		public function LumbarLog() {
			// constructor code
		}
		// initialization function. Sets up user_id and app for 	
		// communication with DB.
		public static function initialize($userId:String, $app:uint) {
			if ($userId.length != 8 || ($app < 0 || $app > 1)) {
				throw new Error("Error: LumbarLog initialize fail. Check length of user id. App argument can only be 0 or 1");
			} else {
				// if login is successful...
				LumbarLog.USER_ID = $userId;
				LumbarLog.APP = $app;
				LumbarLog.IS_LOGGING = true;
				// automagically add login entry to the DB
				addEvent('login');
			}
			
		}
		// function addEvent communicates with DB
		public static function addEvent($eventName:String) {
			trace ('addEvent called');
			var urlVar:URLVariables;
			if (LumbarLog.IS_LOGGING == false) {
				throw new Error("addEvent failed. User not successfully initialized.");
			} else {
				trace ('logged in ' + LumbarLog.urlLoader);
				// User is logged in. Send data to PHP script
				urlVar = new URLVariables();
				urlVar.eventType = $eventName;
				urlVar.app = LumbarLog.APP;
				urlVar.userId = LumbarLog.USER_ID;
				LumbarLog.url.data = urlVar;
				LumbarLog.urlLoader.load(LumbarLog.url);
			}
		}
		
		private static function onLoaderComplete($e:Event) {
			trace ("Load complete: " + $e.target.data);
			//feedback_txt.text = $e.target.data;
		}
		
		private static function onLoaderError($e:IOErrorEvent) {
			trace ("Load error: " + $e.target.text);
			//feedback_txt.text = $e.target.data;
		}

		private static function securityErrorHandler($e:SecurityErrorEvent) {
			trace ("securityErrorHandler: " + $e);
		}

	}
	
}